<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form method="post" action="./upload.jsp" enctype="multipart/form-data">
字段1：<input id="a" name="a" type="text" /><br/>
字段2：<input id="b" name="b" type="text" /><br/>
文件3：<input type="file" id="file" name="file" /><br/>
<input type="submit">
</form>
</body>
</html>